Realtek Semiconductor Inc.

Huang-lin Kuo

Chao-Min Lai

Yu-Jen Lin

Hung-Wei Wang

A system on a chip (SoC) with a Universal Asynchronous Receiver/Transmitter (UART) interface includes a UART interface circuit, a detection circuit, and a control circuit. The UART interface circuit includes: a plurality of UART signal pads for receiving and transmitting signals; and a UART voltage pad for receiving an external operating voltage. The detection circuit is configured to detect the magnitude of the external operating voltage and thereby generate a detection result. The control circuit is configured to determine setting of a supply voltage for the plurality of UART signal pads according to the detection result. The control circuit makes the setting of the supply voltage be compatible with the external operating voltage according to the detection result, wherein the external operating voltage is a lower first voltage or a higher second voltage, and the first lower voltage is equal to an internal device operating voltage of the SoC.

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HSINCHU, Taiwan

Huang-lin Kuo